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Cisco IOS Router Commands

There are 3 modes operation the Cisco IOS.

�        Disabled mode

�        Enabled mode

�        Configuration mode

Disabled mode you can use a limited number of commands. This is used primarily to monitor the router.
Enabled mode is used to show configuration information, enter the configuration mode, and make changes to the configuration.
Configuration mode is used to enter and update the runtime configuration.
To get a list of the commands for the cisco type '?' at the prompt. Further information about any command, type the command followed by  '?'.

clear	Reset functions
clock	Manage the system clock
configure	Enter configuration mode
debug	Debugging functions (see also 'undebug')
disable	Turn off privileged commands
enable	Turn on privileged commands
erase	Erase flash or configuration memory
exit	Exit from the EXEC
help	Description of the interactive help system
login	Log in as a particular user
logout	Exit from the EXEC
no	Disable debugging functions
ping	Send echo messages
reload	Halt and perform a cold restart
setup	Run the SETUP command facility
show	Show running system information
telnet	Open a telnet connection
terminal	Set terminal line parameters
test	Test subsystems, memory, and interfaces
traceroute	Trace route to destination
tunnel	Open a tunnel connection
undebug	Disable debugging functions (see also 'debug')
verify	Verify checksum of a Flash file
write	Write running configuration to memory, network, or terminal
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access-lists	List access lists
arp	ARP table
buffers	Buffer pool statistics
configuration	Contents of Non-Volatile memory
controllers	Interface controller status
debugging	State of each debugging option
dialer	Dialer parameters and statistics
extended	Extended Interface Information
flash	System Flash information
flh-log	Flash Load Helper log buffer
history	Display the session command history
hosts	IP domain-name, lookup style, name servers, and host table
interfaces	Interface status and configuration
ip	IP information
isdn	ISDN information
line	TTY line information
logging	Show the contents of logging buffers
memory	Memory statistics
privilege	Show current privilege level
processes	Active process statistics
protocols	Active network routing protocols
queue	Show queue contents
queueing	Show queueing configuration
reload	Scheduled reload information
route-map	route-map information
running-config	Current operating configuration
sessions	Information about Telnet connections
smf	Software MAC filter
stacks	Process stack utilization
startup-config	Contents of startup configuration
subsys	Show subsystem information
tcp	Status of TCP connections
terminal	Display terminal configuration parameters
users	Display information about terminal lines
version	System hardware and software status

Other Useful Commands

View the Software Version
View the Ethernet IP
View the Serial IP
View the Default Route
View the Filters
View the Bandwidth
Add a Static Route
Change the Dial Number
Turn Filters On and Off
Ping from the Router
Traceroute from the Router

View the Software Version

Cisco>en

Cisco#wr term    <--- Shows running configuration    

Building configuration...

Current configuration:

!

version 11.2

no service udp-small-servers

no service tcp-small-servers

!

hostname Cisco

!

interface Ethernet0

 ip address 192.168.1.1 255.255.255.0

!

interface Serial0

 ip address 192.168.6.1 255.255.255.0

 encapsulation frame-relay

 frame-relay lmi-type ansi

!

interface Serial1

 ip address 192.168.4.2 255.255.255.0

 encapsulation frame-relay

 bandwidth 1536

 keepalive 5

 frame-relay map ip 192.168.4.1 101 IETF

!

router rip

 version 2

 network 192.168.4.0

 network 192.168.6.0

 neighbor 192.168.6.2

 neighbor 192.168.4.1

!

ip classless

ip route 0.0.0.0 0.0.0.0 192.168.6.2

ip route 0.0.0.0 0.0.0.0 192.168.4.1

!

line con 0

line aux 0

line vty 0 4

login

!

end

View Ethernet IP

Router#wr term

This will show the running configuration.

Within the configuration, see an interface ethernet 0 section:

interface Ethernet0

ip address 38.150.93.1 255.255.255.0

no ip directed-broadcast

View Serial IP

Router#wr term

Within the configuration, see an interface serial 0 section:

interface Serial0

ip address 38.21.10.100 255.255.255.0

ip broadcast-address 38.21.10.255

ip access-group 106 in

encapsulation frame-relay

bandwidth 56

no fair-queue

frame-relay map ip 38.21.10.1 500 IETF

View Default Route

Router#wr term

Within the configuration, see an ip route section. 

In the ip route section, look for a route:

ip route 0.0.0.0 0.0.0.0 38.167.29.1

The last ip address is the POP ip.

View Filters

Router#wr term

Under interface serial 0, look for:

ip access-group 104 in

ip access-group 105 out

Its means that access-group 104 is the inbound filter set and

access-group 105 is the outbound filter set.

Then, continue to look in the configuration for the access-list statements:

(Example for access-list statements)

access-list 104 deny   ip 38.166.101.0 0.0.0.255 any

access-list 104 permit tcp any any established

access-list 104 permit tcp any eq ftp-data any gt 1023

access-list 104 permit udp any eq domain any gt 1023

access-list 104 permit udp any eq domain any eq domain

access-list 104 permit icmp any any

access-list 104 permit udp any eq snmp any gt 1023

access-list 105 deny   ip any 38.166.101.0 0.0.0.255

access-list 105 permit tcp any any established

access-list 105 permit tcp any any eq ftp

access-list 105 deny   udp any eq netbios-ns any

access-list 105 deny   udp any eq netbios-dgm any

access-list 105 permit ip any any

View Bandwidth

Router#wr term

Within the config, see an interface serial 0 section:

interface Serial0

ip address 38.21.10.100 255.255.255.0

ip broadcast-address 38.21.10.255

ip access-group 106 in

encapsulation frame-relay

bandwidth 56

no fair-queue

frame-relay map ip 38.21.10.1 500 IETF

Add a Static Route

Cisco#config t

Enter configuration commands, one per line.  End with CNTL/Z.

Cisco(config)#ip route DEST.DEST.DEST.DEST MASK.MASK.MASK.MASK GATE.GATE.GATE.GATE

where: DEST.DEST.DEST.DEST = The destination network the static route is for

       MASK.MASK.MASK.MASK = The subnet mask of the destination network

       GATE.GATE.GATE.GATE = The gateway of the static route

Example route statement:

ip route 38.222.75.0 255.255.255.0 38.20.5.1

Cisco(config)#^Z (hit <control> z)

Write the entry to memory:

Cisco#wr mem

Building configuration...

[OK]

Change Dial Number

Type en to put the router in enable mode:

test.com>en

The password should be the same as the one used to telnet in.

Password:

To view the router's configuration, type:

test.com#show config

There will be a line in the configuration that says:

dialer map IP 38.1.1.1 speed 64 name LD3330 2707000

The 2707000 is the dial number.

NOTE: Record what interface the dialer map IP line is under because you will need to 

use that interface when changing the number.

Type config t to configure from terminal.

test.com#config t

Enter configuration commands, one per line.  End with CNTL/Z.

Enter the interface that the dialer map IP line is under:

test.com(config)#interface BRI0

Add in the new dialer map IP line with the new phone number:

test.com(config)#dialer map IP 38.1.1.1 speed 64 name LD3330 [new number]

Now, remove the old dialer map IP line.

To remove a line, type no and then the line.

For example, to remove the old dialer map IP, type:

test.com(config)#no dialer map IP 38.1.1.1 speed 64 name LD3330 2707020

Now leave config mode:

test.com(config)# [control] z

Save changes:

test.com# write mem

Building configuration...

[OK]

Verify the new number is in the config:

test.com#show config

The new number should be in the dialer map IP line.

Turn Filters On and Off

To turn the filters off:

Router#configure terminal

Router(config)#interface Serial0

Router(config-if)#no ip access-group 104 in

Router(config-if)#no ip access-group 105 out

Router(config-if)# Hit CTRL-Z

Router#wr mem

Building configuration...

[OK]

Router#

To turn the filters on:

Router#configure terminal

Router(config)#interface Serial0

Router(config-if)#ip access-group 104 in

Router(config-if)#ip access-group 105 out

Router(config-if)# Hit CTRL-Z

Router#wr mem

Building configuration...

[OK]

Router#

Cisco Router Configuration Commands

Learn Cisco Router Configuration code, its help to config router and clear all concepts in study.

Requirement	Cisco Command
Set a console password to cisco	Router(config)#line con 0 Router(config-line)#login Router(config-line)#password cisco
Set a telnet password	Router(config)#line vty 0 4 Router(config-line)#login Router(config-line)#password cisco
Stop console timing out	Router(config)#line con 0 Router(config-line)#exec-timeout 0 0
Set the enable password to cisco	Router(config)#enable password cisco
Set the enable secret password to peter.This password overrides the enable password and is encypted within the config file	Router(config)#enable secret peter
Enable an interface	Router(config-if)#no shutdown
To disable an interface	Router(config-if)#shutdown
Set the clock rate for a router with a DCE cable to 64K	Router(config-if)clock rate 64000
Set a logical bandwidth assignment of 64K to the serial interface	Router(config-if)bandwidth 64 Note that the zeroes are not missing
To add an IP address to a interface	Router(config-if)#ip addr 10.1.1.1 255.255.255.0
To enable RIP on all 172.16.x.y interfaces	Router(config)#router rip Router(config-router)#network 172.16.0.0
Disable RIP	Router(config)#no router rip
To enable IRGP with a AS of 200, to all interfaces	Router(config)#router igrp 200 Router(config-router)#network 172.16.0.0
Disable IGRP	Router(config)#no router igrp 200
Static route the remote network is 172.16.1.0, with a mask of 255.255.255.0, the next hop is 172.16.2.1, at a cost of 5 hops	Router(config)#ip route 172.16.1.0 255.255.255.0 172.16.2.1 5
Disable CDP for the whole router	Router(config)#no cdp run
Enable CDP for he whole router	Router(config)#cdp run
Disable CDP on an interface	Router(config-if)#no cdp enable

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Cisco Router Show Commands

Requirement	Cisco Command
View version information	show version
View current configuration (DRAM)	show running-config
View startup configuration (NVRAM)	show startup-config
Show IOS file and flash space	show flash
Shows all logs that the router has in its memory	show log
View the interface status of interface e0	show interface e0
Overview all interfaces on the router	show ip interfaces brief
View type of serial cable on s0	show controllers 0 (note the space between the 's' and the '0')
Display a summary of connected cdp devices	show cdp neighbor
Display detailed information on all devices	show cdp entry *
Display current routing protocols	show ip protocols
Display IP routing table	show ip route
Display access lists, this includes the number of displayed matches	show access-lists
Check the router can see the ISDN switch	show isdn status
Check a Frame Relay PVC connections	show frame-relay pvc
show lmi traffic stats	show frame-relay lmi
Display the frame inverse ARP table	show frame-relay map

Cisco Router Basic Operations

Requirement	Cisco Command
Enable	Enter privileged mode
Return to user mode from privileged	disable
Exit Router	Logout or exit or quit
Recall last command	up arrow or <Ctrl-P>
Recall next command	down arrow or <Ctrl-N>
Suspend or abort	<Shift> and  <Ctrl> and 6 then x
Refresh screen output	<Ctrl-R>
Compleat Command	TAB

Cisco Router Copy Commands

Requirement	Cisco Command
Save the current configuration from DRAM to NVRAM	copy running-config startup-config
Merge NVRAM configuration to DRAM	copy startup-config running-config
Copy DRAM configuration to a TFTP server	copy runing-config tftp
Merge TFTP configuration with current router configuration held in DRAM	copy tftp runing-config
Backup the IOS onto a TFTP server	copy flash tftp
Upgrade the router IOS from a TFTP server	copy tftp flash

Cisco Router Debug Commands

Requirement	Cisco Command
Enable debug for RIP	debug ip rip
Enable summary IGRP debug information	debug ip igrp events
Enable detailed IGRP debug information	debug ip igrp transactions
Debug IPX RIP	debug ipx routing activity
Debug IPX SAP	debug IPX SAP
Enable debug for CHAP or PAP	debug ppp authentication
Switch all debugging off	no debug all undebug all

Cisco Router Configuration Tutorial

Download CISCO Router Configuration Tutorial PDF File.

>> Download PDF 

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In Part 1 Chapter 6 and 11 is most important (Sub-netting and Configuration). Whole part 1 to 4 required this.

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